Failed To Change Mac Address For Wireless Network Connection Set The First Octet Work Page

Follow these steps systematically. The solution is almost always in choosing a valid first octet.

If you have tried valid first octets (e.g., 02:01:02:03:04:05) and still get the error, your wireless driver is blocking MAC changes entirely. This is common with:

You may need to:

Let’s break down the first octet in binary:

This means the first two bits (b1 b0) of the MAC address must be 10 in binary. Follow these steps systematically

Valid first octet patterns (hexadecimal):

| Hex | Binary (first 2 bits) | Valid? | Notes | |------|----------------------|--------|-------| | 0x0? | 00 | No | Globally unique, not locally administered | | 0x1? | 01 | No | Multicast + global | | 0x2? | 10 | Yes | ✅ Locally administered, unicast | | 0x3? | 11 | No | Multicast + local | | 0x4? | 00 | No | Global | | 0x5? | 01 | No | Multicast + global | | 0x6? | 10 | Yes | ✅ Locally administered, unicast | | 0x7? | 11 | No | Multicast + local | | 0x8? | 00 | No | Global | | 0x9? | 01 | No | Multicast + global | | 0xA? | 10 | Yes | ✅ Locally administered, unicast | | 0xB? | 11 | No | Multicast + local | | 0xC? | 00 | No | Global | | 0xD? | 01 | No | Multicast + global | | 0xE? | 10 | Yes | ✅ Locally administered, unicast | | 0xF? | 11 | No | Multicast + local | You may need to:

Conclusion: The first octet must be 02, 06, 0A, 0E, 12, 16, 1A, 1E, 22, 26, 2A, 2E, 32, 36, 3A, 3E, 42, 46, 4A, 4E, 52, 56, 5A, 5E, 62, 66, 6A, 6E, 72, 76, 7A, 7E, 82, 86, 8A, 8E, 92, 96, 9A, 9E, A2, A6, AA, AE, B2, B6, BA, BE, C2, C6, CA, CE, D2, D6, DA, DE, E2, E6, EA, EE, F2, F6, FA, FE – but in practice, most drivers accept only even values for the second hex digit: 2, 6, A, E.